Encapsulated JS Objects with Module Pattern

foobar.js

var Foobar = function (foo) {

    /* Private variables */

    var _foo = foo || 'default';

    /* Private functions */

    function magic() {

        _foo = 'magic';
    }

    /* Public functions */

    this.getFoo = function () {

        return _foo;
    }

    this.setFoo = function (foo) {

        _foo = foo;
        magic();
    }
}